In 1988, Haldane predicted that quantized Hall physics can be intrinsic to a material [1]}. To generate the effect without an external magnetic field, he had to consider an atomic lattice with at least two degrees of freedom per repeating cell and to rely on complex hopping parameters that break the time-reversal symmetry. Chromium-doped thin films of (Bi,Sb)\(_2\) Te\(_3\)  produced the experimental validation of Haldane's prediction [2]}, [3]}. Two decades after Haldane's seminal work, the quantum Hall physics was predicted to also manifest in systems with electro-magnetic [4]} and mechanical [5]} degrees of freedom. These predictions became reality in 2009, when confirmed with gyromagnetic photonic crystals [6]}, and in 2015, when confirmed with gyroscope lattices [7]}, respectively. These earlier advances flourished in extremely active fields, where quantum Hall physics is investigated with both quantum materials and classical meta-materials.
